<!DOCTYPE html>
<html>
  <head>
    <title>Hello World!</title>
  </head>
  <body>
    <h1>Hello World!</h1>
    <a href="http://localhost:3000/" >收银</a>

    <script>
        // get the system platform using node.js
        var os = require('os');
        // os.platform() 方法返回一个字符串, 指定Node.js编译时的操作系统平台
        document.write(`kaimo is running on ${os.platform()}、${os.version()}`);
    </script>

  </body>
</html>